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HomeWeb Front-endJS TutorialDetailed explanation of the steps to implement JSON.stringify in JS

这次给大家带来JS实现JSON.stringify步骤详解,JS实现JSON.stringify的注意事项有哪些,下面就是实战案例,一起来看一下。

JSON.stringify是浏览器高版本带的一个将JS的Objtect对象转换为JSON字符串的一个方法,不过再IE6下面,并不存在JSON这一对象,因此,用到此方法时,需要写一套兼容性的代码。接下来通过本文给大家分享JS实现JSON.stringify的实例代码,需要的朋友参考下吧

 JSON.stringify是浏览器高版本带的一个将JS的Objtect对象转换为JSON字符串的一个方法,不过再IE6下面,并不存在JSON这一对象,因此,用到此方法时,需要写一套兼容性的代码。 JSON.stringify的一些规则以及注意点:当对象为数字,null,boolean的时候,直接转换为相应的字符串就可以了。 但是string,function,undefined,object,array等,需要特殊处理。

1.undefined,该类型使用JSON.stringify处理的时候,如果对象就是undefined,将会输出"undefined",如果对象是数组的元素,那么将会变成null,比如:[undefined],stringify之后变成了"[null]";如果该对象是object的元素,那么该属性将当作不存在,不输出,比如{a:1,b:undefined},stringify之后是"{\"a\":1},B属性直接抛弃。

2.字符串在拼接的时候需要把内部的双引号处理掉

/** 
 * JSON stringify的实现 
 * @author norkts<norkts> 
 * @version 1.0 2015-11-24 15:11 实现了基本功能 
 * @version 1.1 2015-11-24 15:19 norkts 增加了JSON.stringify的兼用代码实现 
 * @version 1.2 2015-11-24 15:49 norkts 修改数组indexOf在IE下不兼容的写法,修改了undefined值的特殊处理 
 */ 
(function(NS){ 
 
 //简单类型 
 var simpleTypes = ["number", "boolean", "undefined", "string", "function"]; 
  
 //JSON.stringify的主函数 
 function stringify(object){ 
  var type = typeof object; 
   
  //如果是简单类型,则直接返回简单类型的结果 
  if(indexOf(simpleTypes, type) > -1){ 
   return parseSimpleObject(object); 
  } 
 
  //数组对象的 
  if(object instanceof Array){ 
   var len = object.length; 
   var resArr = []; 
   for(var i = 0; i  -1){ 
 
     //undefined特殊处理,数组中变成null 
     if(itemType != "undefined"){ 
      resArr.push(parseSimpleObject(object[i])); 
     }else{ 
      resArr.push("null"); 
     } 
      
    }else{ 
     //递归处理JS数组中的复杂元素 
     resArr.push(stringify(object[i])); 
    } 
   } 
    
   return "[" + resArr.join(",") + "]"; 
  } 
   
  //普通object对象 
  if(object instanceof Object){ 
   if(object == null){ 
    return "null"; 
   } 
    
   var resArr = []; 
    
   for(var name in object){ 
    var itemType = typeof object[name]; 
    if(indexOf(simpleTypes, itemType) > -1){ 
     //undefined特殊处理,object中不编码 
     if(itemType != "undefined"){ 
      resArr.push("\"" + name + "\":" + parseSimpleObject(object[name]));  
     } 
    }else{ 
     resArr.push("\"" + name + "\":" + stringify(object[name])); 
    } 
   } 
    
   return "{" + resArr.join(",") + "}"; 
  } 
 } 
  
 function parseSimpleObject(object){ 
  var type = typeof object; 
  if(type == "string" || type == "function"){ 
   return "\"" + object.toString().replace("\"", "\\\"") + "\""; 
  } 
   
  if(type == "number" || type == "boolean"){ 
   return object.toString(); 
  } 
   
  if(type == "undefined"){ 
   return "undefined"; 
  } 
   
  return "\"" + object.toString().replace("\"", "\\\"") + "\""; 
 } 
  
 function indexOf(arr, val){ 
  for(var i = 0; i <p>相信看了本文案例你已经掌握了方法,更多精彩请关注php中文网其它相关文章!</p>
<p>推荐阅读:</p>
<p><a href="http://www.php.cn/js-tutorial-394160.html" target="_blank">解析Json有哪些方法</a><br></p>
<p style="text-align: left;"><a href="http://www.php.cn/js-tutorial-394158.html" target="_blank">ajax和jsonp以及json区别使用步骤详解</a><br></p></norkts>

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